Physics
For greater efficiency of block and tackle pulley system:
- The lower block should be of negligible weight.
- The upper block should be of negligible weight.
- The number of pulleys should be minimum.
- The weight of the rope should be equal to the weight of the pulleys.
Machines
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Answer
The lower block should be of negligible weight.
Reason — In a block and tackle system, the lower block moves with the load and if it has significant weight, extra effort is needed to lift it along with the load, which reduces efficiency.
Therefore, for greater efficiency, the lower block should have negligible weight.
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